教員・研究者紹介

永井武彦

所属	工学部電子情報工学科
学位	博士（工学）
専門	半導体物性評価
ジャンル	科学・技術/新技術
コメント	高効率な太陽電池、高出力なパワーデバイス、安全な全固体電池開発に資する研究を行っている。具体的には、異種材料の接合界面における電子状態の制御技術開発に関する研究を専門とする。
リサーチマップ	https://researchmap.jp/read0120078

太陽電池、パワーデバイス、全固体電池などの界面電子状態の解明や制御法の開発による、高効率で安価・安全なエネルギー環境デバイスの開発をめざす。

表面・界面物性, 光物性, 光電子分光

Machine learning study of surface and bulk compositional features governing Ge-incorporated kesterite solar cell performance
Sanghun Lee; Shinho Kim; Hitoshi Tampo; Takehiko Nagai; Yangdo Kim
Materials Today Communications 50 114436-114436 2026年1月 [査読有り]
Deep learning ellipsometry: Ultrafast and high-accuracy determination of optical constants, film structures, and bandgaps
Ryosuke Oka; Yuki Yamamoto; James N. Hilfiker; Takuji Maekawa; Hitoshi Tampo; Takehiko Nagai; Hiroyuki Fujiwara
Materials Today Communications 48 113448-113448 2025年9月 [査読有り]
Characterizing ZnMgO/Sb2Se3 Interface for Solar Cell Applications
Yonghun Je; Jaeeun Jeon; Hitoshi Tampo; Takehiko Nagai; Shinho Kim; Yangdo Kim
physica status solidi (RRL) – Rapid Research Letters 19 (2) 2400267(1)-2400267(6) 2024年11月26日 [査読有り]

Deconvolution of heat flow of lithium-ion batteries operated at low temperature , Jun Okagaki; Takehiko Nagai; Suguru Ueda; Shun Nishijima; Yohei Kawahara; Tsuyoshi Shibata; Ken Okada; Yoshiyasu Saito , The 23rd International Meeting on Lithium Batteries , 2026年7月18日
Heating-Rate-Dependent Thermal Behavior of Sulfide-Based All-Solid-State Batteries after Degradation , Jun Okagaki; Takehiko Nagai; Yuki Yamaura; Zyun Siroma; Koji Kawamoto; Hikaru Sano , The 23rd International Meeting on Lithium Batteries , 2026年7月15日
Characterization of electronic properties of (Ba,Sn)S thin films by UPS and IPES , Takehiko Nagai; Soma Endo; Hitoshi Tampo; Hajime Shibata; Norio Terada; Fumio Kawamura; Hidenobu Murata , Material Research Meeting 2025(MRS-J) , 2025年12月10日

Characterization of Electronic Structure in (Ba,Sn)S Thin Film Using XANES , Takehiko Nagai; Hidenobu Murata; Hitoshi Tampo; Fumio Kawamura , UVSOR ACTIVITY REPORT 2023 , 50 , 145 , 2024年
Excitons and electron-hole plasmas in highly excited GaN , T. Nagai; T. J. Inagaki; Y. Kanemitsu , Physica Status Solidi C: Conferences , 1 , 495 , 498 , 2020年12月
水晶振動子センサーによるシラン-水素混合気体中のシラン濃度比測定 , 鈴木淳; 柄澤稔; 永井武彦; 野中秀彦; 近藤道雄 , 真空 , 53 , 3 , 162 , 164 , 2010年3月20日
概要：  Densities of silane and hydrogen gas mixtures used for the production of thin silicon solar cell were measured using a quartz sensor, which output depends on viscosity and molecular weight of gas measured. The measurement for the silane-hydrogen gas mixtures revealed that the quartz sensor output depends on the silane and hydrogen densitites, can derive each density in the mixtures. From the results of the measurement, working curves were dereived for the pressure of 133-1333.0 Pa for the industrial production at room temperature. Resolusions of the density measured are 0.03 vol.% at total pressure of 1333.0 Pa, and are comparable to the results by a quartz pressure gauge previously reported. Finally, it was shown that the silane density ratio does not agree with the silane flow ratio, indicating that <i>in-situ</i> silane density measurement is important to control silane density.<br>